I will recreate this issue.
1. loaded KFLL (FSDT Scenery)
2. called GSX ground services
3. selected Operate Jetways and it worked.
4. loaded KSLC airport with SODE xml
5. called GSX ground services
6. selected Operate Jetways and the jetway disappeared.
7. called GSX ground services, it says jetway operating. (But no visible jetway)
8. from Addons TAB, SODE reloaded all but the disappeared jetway
9. from Addons TAB, Restarted Couatl, still no visible jetway
10 from Addons TAB, SODE reloaded all jetways complete now
11 loaded KFLL (FSDT scenery) again and jetways worked.
12 loaded KSLC again and jetways worked as well, wow!.
13 closed sim.
14 loaded KSLC and jetway disappeared again.
The issue is intermittent or out of cycle. GSX is not handling xml SODE files as before. Tested FSX. P3Dv4.5 and P3Dv5.3
Patricio Valdes